Casing is a large-diameter pipe that serves as the structural retainer for the walls of
oil and gas wells, or wellbore. It is inserted into a well bore and cemented in place
to protect both subsurface formations and the wellbore from collapsing and to allow
drilling fluid to circulate and extraction to take place.
O.D. | Nominal | O.D. | W.T. | Nominal | Type of pipe end | ||||||||
Weight | Weight | Grade | |||||||||||
(lb/ft) | (kg/m) | J-55 | L-80 | N-80 | C-90 | ||||||||
In. | mm | In. | mm | H-40 | K-55 | M-65 | C-95 | Type1,Q | T-95 | P-110 | |||
10 3/4" | 32.75 | 10.750 | 273.05 | 0.279 | 7.09 | 48.74 | PS | -- | -- | -- | -- | -- | -- |
40.50 | 10.750 | 273.05 | 0.350 | 8.89 | 60.27 | PS | PSB | PSB | -- | -- | -- | -- | |
45.50 | 10.750 | 273.05 | 0.400 | 10.16 | 67.71 | -- | PSB | PSB | -- | -- | -- | -- | |
51.00 | 10.750 | 273.05 | 0.450 | 11.43 | 75.90 | -- | PSB | PSB | PSB | PSB | PSB | PSB | |
55.50 | 10.750 | 273.05 | 0.495 | 12.57 | 82.59 | -- | -- | PSB | PSB | PSB | PSB | PSB | |
60.70 | 10.750 | 273.05 | 0.545 | 13.84 | 90.33 | -- | -- | -- | -- | -- | PSB | PSB | |
65.70 | 10.750 | 273.05 | 0.595 | 15.11 | 97.77 | -- | -- | -- | -- | -- | PSB | PSB | |
73.20 | 10.750 | 273.05 | 0.672 | 17.07 | 108.93 | -- | -- | -- | -- | -- | P | -- | |
79.20 | 10.750 | 273.05 | 0.734 | 18.64 | 117.86 | -- | -- | -- | -- | -- | P | -- | |
85.30 | 10.750 | 273.05 | 0.797 | 20.24 | 126.94 | -- | -- | -- | -- | -- | P | -- | |
P - Plain; S - Short round thread; L - Long round thread; B - Buttress thread |